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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7b778456314a7e54ee225895a89da1fcaa19b2c4cda1490b7e72e18331d947b' 
  AND token = 'gTBwggEURoveg2yYFIkQ544DtzlmZv06Rarg0D/9oFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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