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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91406b2139ee738401e5b0e2e1fdc43c2e214c791870897ed5de5afadfa63691' 
  AND token = 'qr7ClJedvsWt2nvOAzZCDcfaex8PlrZa+F01N5vaOxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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