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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87475dfa31a3868cb9150ed5da2e2befccc5023e31e9feaf6d2c919af921b60a' 
  AND token = 'oGUmyLWGx1mnRwLqQ4GgBNdKbmQ1iL6R97cFFEtDgmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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