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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7db903d64ed318ff3874dafec14454639bda663be74be47d0fe935799eb8b09' 
  AND token = 'bTPlVwS2TZMH4esaG/dPhvYAPKEWjEP7FiItXJydIts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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