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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd23e03f3742afe23b0e0c1469bb11d9ddfd4f2e521878c408b6918153692a3c' 
  AND token = '9oTqitSOe3SqfOcdeF+lkhWbx0IpMOeot/+LNkGxEmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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