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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11acd82a27fce9947bfaa65ee16ac2cdbc9cf7e8eeddae1b8f7e8d12ed32d521' 
  AND token = 'KKNK9Ve718IHLy9E+XT/V/MN1oL+HlobwtmGdP+efqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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