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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ef02761d10ef12e6526edf27c97b32aabe19aa9a2b0bd54151d11027decf30b' 
  AND token = 'ZiJD2hOsuGLyYJDlk7GSUF4TY2Zf+nd6pEJzBnp0eFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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