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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ce15ae54f90f7d4a4103c2fd6084d6ee0a04525b892d4c7fff60a32c8524a84' 
  AND token = 'fRhH1i+gHBXaz3HlJY453zodnhH4VbOO3VpLljNzeKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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