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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e30fd60ef91fb8714e6b08bba615d64dd5eaa4e4a47d22c9129a70394f0f398e' 
  AND token = '1venkMqTuN7AGPQOuK2WrljmhMP5dfqb6x89LBz5rWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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