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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9e41391c352c112479ba1867b16087b308d7ab46616a9058ebcefa4d38d4e87' 
  AND token = 'O/VdFO4tbZFBvhv6p8sm6k3DyibCxYUQStzd+bta+IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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