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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52ee665843d086b090575e9c551cea2c6e6fcd8a1fc894214c1d80fbcc60c59e' 
  AND token = 'k+q+CEfK0M4XcmVN0YeBT7BC40FU7hPY2YK2v+rR7Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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