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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '318f0cca8f759c47424648fa4172b2bdf6e03e3a7a70b46f1b799d632e6127fc' 
  AND token = '4almYEY94mhgEmWlgpjYaeBfnt3XcMsuQRs6Xn471RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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