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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7313eb537e1a810ba0878106194904ea595a8223f10ad548ab8778d7ed3a7e42' 
  AND token = 'AChlXKC7E7qXZbutyMfKH/IFEolNDH4i3sGjjv89sP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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