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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9e7c3e0dd08de9904c94054cd7ba744d08606301bed700c66cb7fe55a993493' 
  AND token = 'j1tXVqTqmc3ZqTFHURrR34tcj0P65lsrzo5YvDNVUnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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