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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d40ddea36286c32cf2bbf73c80bb4c664ac1f593cd647a74656a111eefb0e7a' 
  AND token = 'NUUzquTy4lc9wLJDyK06BbCjkV8Ag28Emz7CGyrHma0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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