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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68411071761fdf4b60cf9bad0bba918135dad387cc9534b4ac901b0ca6afbecd' 
  AND token = 'qkdAum80aQ138Na8xnU6aWx3BwqrKbGTYGj37dWEnKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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