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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eaf7275aece296ed932eb8cf045024a6cd37d3739db158b62a88888f74dd16b' 
  AND token = '29noymRNvpUaDocUodr9EDO+XS5nGVGHXtP43XACeEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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