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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1f9e9f8791dfb7d7e0de47a3602481a107bdccc7576611a560dc1d1ed629a58' 
  AND token = 'FQkYx03hoh307Ybvy/zeQYr30WYTyeDxq+5V+xf+GH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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