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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c00b405d7e3d1ce5f0cd68c3640c023e766364023260a5c618b4f8a67c4bacb' 
  AND token = 'jOUfxmTTuat7M2JY7SZ3o4+OyDsBAdDKaLMSmWJ4Z2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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