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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd09aff8da47a0c950df3ebeb99033d44e9070204b998a43127912f606b1dcc94' 
  AND token = 'g/WMyZ+qbEiccLRxdep4DOzHg97zTqswbxLmlCZSI6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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