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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '661b31c53e5a0bea95f5085fc0728ce53a5fa31fffc701e73eb47eab8fd5e603' 
  AND token = 'oQ1PemSP4R9qF6Q+rpggMZc8MeJuFujerU4b5kX91lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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