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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e85c886ebe2d620a582ac715b00d9d6a4dc3a8aa8173de5d97c44715ea1dfebd' 
  AND token = '51VPaTOVM0bWWjm2g/nlhKZx2/uIU5CkBJZlZG2EgNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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