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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c6b4659dce0d0c0ab837c5aa4ba346ad5010e323d45a2d31d2d24e69a6cf250' 
  AND token = 'uHHfN8Ps5jXgil+v0i2qLCG7TSmCPzm6pvAEG+NOP7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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