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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9a875ef5ecf98c450988df629ea39ad926882b021f1f13a917221e4a84bc051' 
  AND token = 'bLdoDozZqt4jCTAtBSqvuuV5jpNEb5tWf+2nIeCH5Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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