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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f28b2786ef3e0970f9610be85809cd44472aa22c01f93631c391c65fb195c5ed' 
  AND token = '3qizCIXQJDadoB8TUy4q0I5Pr9Y2fCRblO/JT/e63eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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