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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e67b2a52f9583088707fc77a5e9d1d152dd1536effe2b9bed9eba35c3e7f5aa3' 
  AND token = 'tan/ZIQgDvN6NfPmgu30DvVNowwGbIzvgrt+X28By2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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