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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b66afa4d6dd58ef7223b0e5f79efc0cafbe666dc505d33b8680d971dd487d4d9' 
  AND token = 'BwE3H5trUkKDh41hp9lDW3zANlVHE8ywzVNmJLP3N1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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