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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fcae4604756851c90e0fa0152ad02fb9086579b897dd5a05bc5f0345c7a69f4' 
  AND token = 'nRotowm00ZNRISwSkKwoIh/foDv/zqH5wtxycuSW4sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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