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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3adc25cd6b65f4083c4d6cfd8acd67fd0078a06d1cfcfd6383e63c1194dd09ef' 
  AND token = '+tzqQPP6elFQxh0dzwYCEXlU0aD4oy7P6uTyrbhpn44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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