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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6875c667f9594609256f92a26ab116f9322a0d86986e3e877303104aa7d11937' 
  AND token = '2XbLlV73HqnB2dHRG0iXWRfrOjC1L+LKG6zMs3Mw6pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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