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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd70fef5afe3f9f0f6875c01ee8b1608162b2108c38dca99d8a2163953a7932bb' 
  AND token = '3lnY4o1efqGKuLFrfJneye9qEXPgHGKaKbuG0l3wmmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}