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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b282f0b1c97942588850b84552eeba1f0e71db96ee0027fe3b65473704542cb9' 
  AND token = 'W2KS7hzxzngf5sxg8/sWLg7e4EVUienYFd0K3FGvAIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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