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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f4079b33f95cf5a9b7ac0cc38c389d7ea0b398be3c9ced57f47700eeae181aa' 
  AND token = 'Po2kGxdQCuA+KfLMbBOSCQKbo5M1G5+LQKAIZHq0pVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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