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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b2ce1d73f5504e6696ba6120da6675e74e143a28f0d88160d312ed9ebc3fd41' 
  AND token = 'aEAC59zWJEZasCJ4OfgyOd7k2Sx9X1o2HNwt/rokRQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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