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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '469979493de221cf26b27b57f93100b8ff0b28a2b6067380a6e91d195d65ca86' 
  AND token = 'o+P4LejuBYGCY20PNxUu37jnlOo6IenzV2DpAMe0V7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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