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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e831c4c3f39f25cab3f84218e56bafbbe86708565598d5f71b3e8e7ab95e6bd' 
  AND token = 'QW+JnkTEWvM2rgXHVLlgkIHWC71j/laemaaxjn+vuA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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