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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd37a9d42e3a0792b000d55e3d665d8dc0b0d077c2b85bf3c385512c3a92adc75' 
  AND token = 'oB+def3XIjeBZABXEc9dcjIVw4D2ETIi6osyxQ6cpLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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