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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '966822e70b5413b98d0fc1a7bf54421d2cd2be400921f992c7a71496412c053e' 
  AND token = 'LSD1rwf2/fv47pV6fiYYoYp4bbh26BADyJgYCuCAUeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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