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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea46855363b96a3eb59d8d256bbd7ec4c69dbda34e08c3e471b6cb0b138d2c9b' 
  AND token = 'PRrRdzxJIw7JpDihVYWjiaw1Hpfh78V0gTvS4adBP70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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