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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55145f52cbff5cfb3f9bd8421c1ec5eea5be221fafd700178ab04b4af05cfa98' 
  AND token = 'zhF1VCi6NDpbC4Gs0omAyG6iz0Lgktor3ywc4VjHG3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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