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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ee3cc97e5673de3d27140f2909c0c569f24d1ee330936243151c693de10a472' 
  AND token = 'GDqhtWLB5QtT1Gwzl77tkb1VYLiXjnj+i5QC2oZ94kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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