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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e95a7bfb3b4759d8b0840b2fcf42bf45c2f8e1d494c3019464373420cdcfb32' 
  AND token = '3Hleane53n3D79Oqp3ivKFZcD4uH6wCwdgfF5QZGr6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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