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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7de78f9a42652276839b68ea9e3afd38eaebd9fc936668b03020e49db887d93' 
  AND token = 'K6YWZw8plUsX5pBRHufzr+lRUXiy0H2rDmHieyXxiwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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