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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '998cd476e3d9e0aad9390940639315ed5ac0e71b4d64670217d82ce0da4e755b' 
  AND token = 'N5Njp8z1Sxhptz1m9NLWHFx8Cnqesb6URedU8zyFN60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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