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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81b28eb4f3653e7e3f11fd0361c9479813bdc4265d912b4211fa210dafdb3fbe' 
  AND token = 'OjXP9g58t0our+z51en9oOOg301VZFDceXSbxUo2L6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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