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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d83c0d17e504bccc55662e14cd3335e0e060efc158e884d0ca2323c4f96038b' 
  AND token = '84IyRL/R8lw5CtbKEfqkqsqZdGAMRz8PfKQ10fAxZfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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