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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87d238964403aefe188e0976b0a032418c36bbc479dbd0d4e7d496d79f2393c8' 
  AND token = 'EytKOwrJ1dm+jWe6ZVdEEEyrpC1894NnKIiwBBpug9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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