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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b8d8ddff9ebae4313f6a54b53c3e2c3cf73e080e0c81c9837f2f850661b8791' 
  AND token = 'Y0xr7VJTsLTFhYCg3I69bu+VrAt9Dks/uxwuy3NTybY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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