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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8838ce0a009a1298a007eb1d74d53743915f5c0592a58249c4ecc95031cede6' 
  AND token = 'tVTxgZ/yk9oJstVqzDnhu7OIF7p2R8lFNSpLVY3hKOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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