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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be1a1b69a9a88a4c7d8a84523044c46b24a6d74f90de24f236d8070b1b0717e0' 
  AND token = 'tMh19617FcqQ/6P07DetQ89yJpzUmeMixLaCHemoBPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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