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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f990f677c9a313cc870c5e4c689e8dbe54be0f1662ec49803b41d2d2f0016e91' 
  AND token = 'W7LffT2XmzOafp/uasTFjJN1E03gKJG/3IQkUWTut6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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