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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c0f49a60473719f153e419f97fb1d18cda8ecaffd9a523dfa78d0cc2ee36b92' 
  AND token = 'jlITuxxDTNV5qyerogz33/IUDQva/pxFNYS4WRIraWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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