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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd176e71e9f128f6f6c97f1e7875c1e7240acad566d86b1ab9898ba3f2e2cc878' 
  AND token = 'YJsK3NN2ibPEkwBvT492ddSkirNHDV8vcOIgfB0GFp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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